Got the about panel to have its text lined up correctly.

app/gfx/font.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef APP_GFX_FONT_H_
 #define APP_GFX_FONT_H_
 
 #include "build/build_config.h"
 
 #include <string>
@@ skipping 118 matching lines @@
   // We need a copy constructor and assignment operator to deal with
   // the Skia reference counting.
   Font(const Font& other);
   Font& operator=(const Font& other);
   // Setup a Skia context to use the current typeface
   void PaintSetup(SkPaint* paint) const;
 
   // Converts |gfx_font| to a new pango font. Free the returned font with
   // pango_font_description_free().
   static PangoFontDescription* PangoFontFromGfxFont(const gfx::Font& gfx_font);
+
+  // Position as an offset from the height of the drawn text, used to draw
+  // an underline. This is a negative number, so the underline would be
+  // drawn at y + height + underline_position;
+  double underline_position() const;
+  // The thickness to draw the underline.
+  double underline_thickness() const;
 #endif
 
  private:
 
 #if defined(OS_WIN)
   // Chrome text drawing bottoms out in the Windows GDI functions that take an
   // HFONT (an opaque handle into Windows). To avoid lots of GDI object
   // allocation and destruction, Font indirectly refers to the HFONT by way of
   // an HFontRef. That is, every Font has an HFontRef, which has an HFONT.
   //
@@ skipping 51 matching lines @@
                 int size, int style);
   // Calculate and cache the font metrics.
   void calculateMetrics();
   // Make |this| a copy of |other|.
   void CopyFont(const Font& other);
 
   // The default font, used for the default constructor.
   static Font* default_font_;
 
   // The average width of a character, initialized and cached if needed.
-  double avg_width();
+  double avg_width() const;
+
+  // Potentially slow call to get pango metrics (avg width, underline info).
+  void InitPangoMetrics();
 
   // These two both point to the same SkTypeface. We use the SkAutoUnref to
   // handle the reference counting, but without @typeface_ we would have to
   // cast the SkRefCnt from @typeface_helper_ every time.
   scoped_ptr<SkAutoUnref> typeface_helper_;
   SkTypeface *typeface_;
 
   // Additional information about the face
   // Skia actually expects a family name and not a font name.
   std::wstring font_family_;
   int font_size_;
   int style_;
 
   // Cached metrics, generated at construction
   int height_;
   int ascent_;
+
+  // The pango metrics are much more expensive so we wait until we need them
+  // to compute them.
+  bool pango_metrics_inited_;
   double avg_width_;
+  double underline_position_;
+  double underline_thickness_;
 #elif defined(OS_MACOSX)
   explicit Font(const std::wstring& font_name, int font_size, int style);
 
   // Calculate and cache the font metrics.
   void calculateMetrics();
 
   std::wstring font_name_;
   int font_size_;
   int style_;
 
   // Cached metrics, generated at construction
   int height_;
   int ascent_;
   int avg_width_;
 #endif
 
 };
 
 }  // namespace gfx
 
 #endif  // APP_GFX_FONT_H_